Dual-output low-power thermostat

The LM56 from National Semiconductor is an accurate, dual-output,
low-power thermostat contained in an 8-pin SMD case. It contains
a 1.25 V bandgap voltage reference, two comparators with
5 °C hysteresis and a temperature sensor. The output voltage of
the sensor is internally linked to the comparators. The supply voltage
may lie in the range 2.7–10 V.